diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index ab2f6880e27b..91bbe4ba6233 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -498,8 +498,6 @@ void mem_cgroup_split_huge_fixup(struct page *head);
 #else /* CONFIG_MEMCG */
 struct mem_cgroup;
 
-#define mem_cgroup_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL))
-
 static inline void mem_cgroup_events(struct mem_cgroup *memcg,
 				     enum mem_cgroup_events_index idx,
 				     unsigned int nr)